Dentoalveolar & Facial Trauma MCQ

Trauma is read in layers, from the outside in and the most-dangerous-first: the airway and the patient as a whole, then the soft tissue, the teeth and alveolus, the mandible, and the midface. The dental focus is the surgical management of the hard and soft tissues, repositioning and splinting dentoalveolar injuries, recognizing and reducing mandibular fractures, and recognizing and referring midface (Le Fort) fractures. A trauma patient is a trauma patient first: the primary survey (airway, breathing, circulation) and ruling out head, neck, and other injuries come before the broken tooth. The pulp and periodontal-ligament response to an injured or avulsed tooth is an endodontic question; here the focus is the bone and the soft tissue.

Initial Assessment

• A trauma patient is assessed by the primary survey first (airway with cervical-spine protection, breathing, circulation), because a compromised airway or hemorrhage kills before a fractured tooth matters.
• Maxillofacial trauma is associated with head, cervical-spine, and other injuries, which must be ruled out before focusing on the dental injury.
• Once the patient is stable, a systematic maxillofacial examination proceeds: soft tissue, occlusion, the teeth and alveolus, the mandible, and the midface.
• Tetanus status is checked for contaminated wounds, and a missing tooth must be accounted for (it may be embedded in soft tissue, aspirated, or swallowed).

Dentoalveolar Injuries

• Dentoalveolar injuries include crown and root fractures, luxations (displacement), avulsion (the tooth out of the socket), and fractures of the alveolar process itself.
• A fractured alveolar segment is repositioned and stabilized with a splint, and displaced or avulsed teeth are repositioned (or replanted) and splinted.
• Splinting for trauma is generally with a flexible (physiologic), short-term splint that allows micromovement, favoring periodontal healing over ankylosis.
• The pulpal and periodontal-ligament consequences (vitality monitoring, the avulsion replantation protocol and storage media, regenerative or root canal therapy) are managed on the endodontic side; here the surgical repositioning and stabilization are the focus.

Mandibular Fractures

• Common mandibular fracture sites include the condyle, angle, body, and symphysis/parasymphysis; fractures are often multiple (for example, a parasymphysis with a contralateral condyle).
• A fracture is 'favorable' when the muscle pull tends to hold the segments together and 'unfavorable' when the muscle pull displaces them.
• Signs of a mandibular fracture include a change in occlusion (the most sensitive sign), a step deformity, abnormal mobility, lower-lip/chin numbness (inferior alveolar nerve), and ecchymosis in the floor of the mouth.
• Management is reduction (realigning the segments to restore occlusion) and fixation (rigid internal fixation or maxillomandibular fixation); a condylar fracture causes deviation toward the fractured side on opening and is often managed closed.

Midface (Le Fort) and Zygomatic Fractures

• The Le Fort classification describes midface fracture levels: Le Fort I is a horizontal fracture above the apices that separates the maxillary alveolus and palate, Le Fort II is pyramidal (through the nasal bridge and infraorbital rims), and Le Fort III is craniofacial dysjunction (separating the midface from the skull base).
• Signs of a midface fracture include a mobile maxilla, malocclusion, periorbital ecchymosis, and (with higher-level fractures) cerebrospinal fluid rhinorrhea.
• A zygomaticomaxillary complex (ZMC) fracture presents with a flattened cheek, infraorbital nerve paresthesia, periorbital ecchymosis, and limited mouth opening from impingement on the coronoid.
• Midface and complex facial fractures are recognized and referred to an oral and maxillofacial surgeon for definitive management.

Soft Tissue Injuries and TMJ Dislocation

• Soft-tissue lacerations are cleaned, debrided, explored for foreign bodies (including tooth fragments), and closed in layers; a missing tooth must be located, because it can be embedded in the lip, aspirated, or swallowed (imaging is used to find it).
• Temporomandibular joint dislocation occurs when the condyle moves anterior to the articular eminence and cannot return, leaving the patient locked open.
• Reduction of a TMJ dislocation is achieved with downward and backward pressure on the posterior mandible (thumbs on the molars/external oblique ridge), guiding the condyle back into the fossa.
• Recurrent dislocation may need further management, and after reduction the patient is advised to limit wide opening.